主体结构是 Uses were limited to administration,功能(或作用)被局限在行政事务上。Pratical是修饰Use的, for computers in hospitals 也是修饰Use的largely是修饰limited的程度的such as 后面列举了两个功能:"keeping track of bills" 和 "sending out invoices",这都是对admistration的补充描述